I guess they would have the jump through behavior. They would be a sprite set to an angle. And the player would be a plataformer.

However, if you simple do that you'll find that the stairs work horribly. You go right though them if you're falling at the wrong angle and sometimes the player would just stop going up and go sideways mid-stair.

I see what you mean. Jumpthru doesn't work well at all when the sprite is at an angle. What about giving them solid behavior and toggling it on and off depending on if the player is on the stairs or not. Works okay in this simple example apart from the player hopping a bit when he runs through the stairs from behind.slopeJumpthruWorkaround.capx (r114)